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Date: Tue, 3 Jun 2003 09:35:29 +0400 (MSD) From: "Nikolai N. Samus" <samus@lnfm1.sai.msu.ru> Subject: Re: [vsnet-gcvs 458] LT Dra is NOT a RCrB-Star Thank you. Such mistakes do happen, and we sometimes name stars that should not be named. R CrB stars are especially "lucky": a very high percentage of stars announced as belonging to the type later turned out to be something different. Best regards N. Samus On Mon, 2 Jun 2003 Bela1996@aol.com wrote: > LT Dra is NOT a RCrB-Star > > According to the 77th Name-List of Variable Stars (IBVS 5422, 27.05.2003)) > LT Dra (=HD172468) is a new RCrB-Star, ranging from about 7.5V to fainter > then 12.6V. This is not the case. > > Looking on the original data from Messina et al (source: see below) one > finds, that there are times, when LT Dra is in normal light, with occasional > fadings below 12mag, but only within a day(!!), next day he is back to normal. At > other times the star is (according to the authors) mostly invisible, but looking > at the data one sees occasional brightings to normal light, but only for a > day(!!). > > I initialized a rather short-lived campaign for this star in the BAV (German > Working Group on Variable stars) only to find within weeks, that this is a > constant star, see here: > http://vsnet.bela1996.de/astronomy/hd172468.html > > Peter Kroll from Sonneberg Observatory has a student there, who measured this > star on more than 800 plates from the Sonneberg-collection, only to find out > that there is nothing unusual (P.Kroll, private communication). > > Further reading on LT Dra = HD 172468: > Messina et al: http://simbad.u-strasbg.fr/cgi-bin/cdsbib?2000A%26A...364..706M > data: http://vsnet.ct.astro.it/sme/web/apt/hd172468/mainpage.html > http://protostar.aas.org/publications/baas/v34n4/aas201/401.htm > vsnet-campaign 886 > > Greetings, > B駘a Hassforther (German Working Group on Variable Stars, BAV) >
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